Monolith construction



June 12, 1928.

1,673,628 L. C. KRUMMEL MONOLI TH C ON S TRUCTfON Filed Aug. 25. 1927 Patented June 12, 1928.

eArE N T "emu.

Louis 0. KRUMMEL, or BRo oK nYN, new YORK.

MONOLITI-I CONSTRUCTION.

Application filed August 23, 1927. Serial No. 214,887.

This invention relates to improvements in systems of concrete construction, moreespecially of the reinforced type, in which precast members are so constructed and ar ranged that they may be assembled with respect to each other as individuals, and thereafter be connected together to form a monolith. i l

lt hasheretofore been proposed to employ pre-cast members in concrete construction work, and the present invention proposes improvements on such constructions in that an improved design and shape of member:

is provided, which-is more readily adapted for interconnection to form the final monolith. I

A further feature of the-present invention is the construction of the pre-cast members so that they are readily adapted to re ceive reinforcing elements which serve in the final structure-both asreinforcements of the. members themselves and to hold the members together. i i V Another feature of this invention is the particular design of the pre-cast members, which are strengthened by reinforcing elements which have a further function of spacing the connecting elements of the struci ture.

One form of execution of the present in V t The floor 22 of the channel 17 is formed durvention has been shown on the accompanying drawings by way of lllustration, 111' which:

Figure '1 is a perspective view of a girder:- membe and two beam members in the par tiully a5 embled condition. 1

Fig.2 a transverse section through the girder. member of Fig. 1, withparts broken away longitudinally ofthe beam members to show the connecting elements in position.

Fig. 3 is a transverse section of one ofthe member-son a larger scale showing the system of reinforcingemployed. Y

In these drawings, the construction and assembly of theseveral members has been illustrated by representing a building wall orabutment to receive the end 11 of a:

port the strains placed thereon inuse,=and

in the particular illustration has been represented as. being formed with a central web 12 having at. its. bottom the outstanding .i'langes 13 at either side: and atits top being bifurcated to form a channel, as will be .more clearly set forth hereinafter.-v The provided'with a flat or horizontal floor 15 (Fig 2) to receive the ends of the beam members. ,1 i

The upper end of both girder and beam members is bifurcated to form the two Walls 16Ldefiningtherebetween a channe1.1 7.. It is preferred to provide both types of memhers with the reinforcing bars 18 in the b0ttom to :receive stresses in tension: and to provide similar longitudinal reinforcing bars 19 in each of the side walls 16. A metal saddle memberEO, havingthe. shape of a veryuflat U, islocated with its upturned ends 21 withinthe side .walls 16. and serving to stiffen the upper endof the girdenor beam member against? longitudinal spreading.

ing the pre-casting ofithe particular memher: and is,- suhstant-ially horizontal. The saddle members are located from point to point along the length of the particular member and project above this floor 22.

:In Fig. i it to be seen that theside walls 16 are deepened adjacent-the notches 14 to afford strength at such points: and it 19 may be looped downward and under the for; the ends of the beam members as shown in Fig. ,2.: i a

The present illustration shows that the floor. 22 of the channel 17 of the girder member is below the floor 22 of the beam HIQHIbGlS by a distance substantially equal to the thickness or diameter of the reinforcing bars 23.

1. As shown i112, the ends of the re- ]spective'beam members B, B rest on the floor 15 of the girder member G. The

floor 17 of the beam members B, B is depressed above the floor 17 of the notches 14 of the girder member G, as shown in Fig. 2, to a level approximating the level of the floor 17 of the girder member G.

In construction work under this system, the beam and girder members are preformed or pro-cast and are raised to the position for use. A girder member G is seated in its proper position upon walls such as 10, and then the beam members B, B are seated with ends resting on the floors 15 of the particular notches 14. Reinforcing bars 23 are then placed in the channel of the girder member, and are held spaced above the floor 22 of this member by the thickness of the saddles 20. Similar reinforcing bars 523" are then located in the channels 17 of the beam members and are held spaced from the floors :22" of these beam members by the saddles 20 thereof. A concrete grouting is then poured into the respective channels to fill the same around the reinforcing bars 23, 23 and in the interstices between the ends of the beams B, B and the walls and floor of the notches 14 of the girder member. When this grouting has set, the whole structure has been joined to form a monolith, and the bars 23 serve to prevent 1ongitudinal movements of the beams B, B with respect to the girder G: and all reinforcing bars join in strengthening the system.

It is obvious that the invention is not limited to the specific illustration set forth, but that it may be modified within the scope of the appended claims.

What is claimed as new is:

1. In a monolith concrete construction, a precast girder having a channel in its upper surface and provided with a notch extending from said channel to the face of the girder, a precast beam having a channel in its upper surface and having an end adapted to bereceived in said notch, reinforcing bars in said channels. the bar in one of said channels overlying a bar in the other of said channels atthe intersection of the channels, and a concrete filling for said channels surrounding and maintaining said bars and joining said beam and girder.

2. In a precast reinforced concrete member, a web and a head, the foot of the web having longitudinal reinforcing bars therein, said head being bifurcated to provide a channel in the upper surface of the member, the bifurcated portions having longitudinal reinforcing bars therein, and transverse reinforcing elements extending across the throat of the bifurcation.

3. In a monolith concrete construction, a precast girder member having a channel in its upper surface and being provided with a notch extcndingfrom face to face of the girder, precast beam members having each a channel in its upper surface and having each an end engaged in said notch so that the beams extend in opposite directions from the girder and have their channels in alinement, the said girder and beam members having longitudinal reinforcing rods in the side walls of the channels and saddle elements extending between said rods to reinforce the members against longitudinal splitting, said saddle elements being exposed in said channel and projecting above the floor thereof, the tops of the saddle elements of the "irdcr member and those of the beam menibersbeing located at different levels, a reinforcing bar in said girder channel and a reinforcing bar in said beam channels, said bars being supported at dill'erent levels and away from the channel floors by said saddle elements, and a concrete filling surroundin Y and maintaining the bars and joining sai beam and girder.

4. In a' pre-cast reinforced concrete memher, a weband a head, said head being bifurcated to provide a channel in the upper surface of the member, the bifurcated portion having longitudinal reinforcing bars therein, and U-shaped transverse reinforcing elements extending across the throat of the bifurcation, the ends of said elements being turned upward and embedded in the bifureated portions.

5. In a pre-cast reinforced concrete member, a web and a head, said head being bifurcated to provide a channel in the upper surface of the member, the bifurcated portions having longitudinal reinforcing, bars therein, and transverse reinforcing elements extending across the bottom of said channel and exposed therein, said elements bein adapted to support a reinforcing bar lai in said channel.

, 6. In a pre-cast reinforced concrete member, a web and a head, said head being bifurcated to provide a channel in the upper surface of the member, the bifurcated portions having longitudinal reinforcing bars therein and transverse reinforcing elements extending across the bottom of said channel and exposed therein, said reinforcing elements projecting above the floor of said channel so that they are adapted to support a bar laid in said channel in spaced relationship to the floor of said channel.

7. In a monolith concrete construction, a pro-cast girder having a channel in its upper surface and provided with a notch extending from said channel to the side face of the girder, the bottom of said notch being below the bottom of the channel, a precast beam having a channel in its upper surface and having an end adapted to be received in said notch to substantiallyfill the same, the floor of the'beam channel being located at a difl'erent level from the floor of the girder channel free for the reception of the girder channel when the two members its respective bar and a concrete filling for are assembled together, reinforcing bars in said channels surrounding and maintaining 10 said channels, the bar in one of said chansaid bars and joining said beam and girder. nels overlying the bar in the other of said in testimony whereof I my signature. channels at the intersection of the channels,

the end of the beam being cut away to leave LOUIS C. KRUMMEL. 

